Picked this up at a local tip shop a while ago for cheapcheap and have finally gotten around to checking it out. It's a short MIDI Keyboard from Reveal, model number MKB02. It turns out the company no longer exists; but Creative did try to save them back in the day.

Anyway, the keyboard is really nice. It has the standard IO: Power plug, power switch and MIDI out. On top you'll find buttons to adjust pitch and octaves.

I was concerned whilst hooking this up as to the polarity of the plug. Usually you get the little symbol somewhere on the unit to dictate where positive is. Every other MIDI device I've seen lately has positive on the outside... but this does seem to be a Japanese thing.

The best way to solve this was to crack the unit open... it's a keyboard nonetheless, so it probably needed an internal clean anyway!

That last photo is of the IO board. The best bit? The power runs in from the DC jack into a friggen bridge rectifier! Why am I so happy/excited about this? It means the polarity doesn't even matter! It more-or-less treats the input as AC and converts it to its own polarity. How good is that!? All devices should do this.

Anyway, the next step was to simply hook it all together into my SC-55. Of course... it just worked perfectly!

I have the same keyboard, and am wondering what adapter to purchase. I don’t know anything about voltage and adapters. I saw that your link was to an Australian company. What sort of adapter would I purchase in the USA to work with this?

I have one of these but haven’t decided if I should get rid of it. I assume the key events are not at all pressure sensitive? I’m considering if it’s worth getting a midi to usb adapter to use it as a spare MIDI controller for a modern DAW?

Also, don’t understand how anyone who has a stack of old hard drives doesn’t also have a box of old power adapters?